`mail.knowledge4u.com.cn`

	DNSSEC	⚠️ Not signed
	A	168.76.12.219^{🇿🇦 ASLINE-AS-AP168.76.0.0/20 Proxy-registered route object}

`knowledge4u.com.cn`

	DNSSEC	⚠️ Not signed
	A	168.76.12.219^{🇿🇦 ASLINE-AS-AP168.76.0.0/20 Proxy-registered route object}
	NS	`ns1.julydns.com` ⭐ ⚠️ Not in parent delegation
	NS	`ns1.judns.com` ⚠️ Not in zone NS records
	NS	`ns2.judns.com` ⚠️ Not in zone NS records
	NS	`ns2.julydns.com` ⚠️ Not in parent delegation
	SOA	`ns1.julydns.com`master@jmdns.com serial=1774850021

Previously MX for

knowledge4u.com.cn

Same first word

mail.broker

mail.school

mail.land

mail.yahoo

mail.edu.ge

mail.ps

mail.edu.ee

mail.gouv.ci

mail.gi

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mail.mil.id

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mail.coupons

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mail.partners

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mail.com.br

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mail.bike

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mail.gov.cn

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mail.guru

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mail.pm

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mail.ltd

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mail.marketing

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mail.fage

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mail.abbott

mail.weir

mail.wroclaw.pl

mail.et

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mail.bz

mail.fakefur.jp

mail.sb

mail.ht

mail.ax

mail.spdns.eu

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DNS History

2 records (1 active, 1 former)

●A168.76.12.2192026-04-05 → 2026-04-27 · 3 obs

○ 2016-02-04 20:21:36
● 2026-04-05 12:39:48
● 2026-04-27 23:11:02

○A219.238.233.282016-02-04 → 2016-02-04 · 3 obs

● 2016-02-04 20:21:36
○ 2026-04-05 12:39:48
○ 2026-04-27 23:11:02

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cn	b.dns.cn, e.dns.cn, d.dns.cn, a.dns.cn...	-
knowledge4u.com.cn	ns1.judns.com, ns2.judns.com	-

✅ Authoritative Response

Server:162.159.27.251

NS records: ns1.judns.com, ns2.judns.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for knowledge4u.com.cn (unsigned zone)

⏱️ Timing

Total: 1438ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`168.76.12.219`

Analysis

IP Addresses

mail.knowledge4u.com.cn points to a single IP address: 168.76.12.219.

Other host names, for instance knowledge4u.com.cn, share IP numbers with mail.knowledge4u.com.cn.

mail.knowledge4u.com.cn - robtex.com